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Progression-free survival and overall survival by age group. Kaplan–Meier estimates according to age (< 65 years and ≥ 65 years) for patients treated with ICI for a progression-free survival and b overall survival. Kaplan–Meier estimates according to age (65–69 years and ≥ 70 years) for elderly patients treated with ICI for c progression-free survival and d overall survival. ICI, immune checkpoint inhibitor; CI, confidence interval
